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China DIN 933 A2-70 Hexagonal Bolts Suppliers - Factory Direct Grade Options & Surface Treatments Available
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China DIN 933 A2-70 Hexagonal Bolts Suppliers - Factory Direct Grade Options & Surface Treatments Available

Discover high-quality hexagonal bolts from reliable China suppliers and factories, meeting the DIN 933 standard for fully threaded designs. Our bolts feature a thread diameter range of M1.6 to M52, available in various grades including 4.8, 8.8, 10.9, and 12.9. Crafted from premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo, these bolts ensure exceptional strength and durability.

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According to the A-level regulations, our bolts cater to diameters (d) of up to 24mm and lengths (l) of up to 10d or 150mm (whichever is smaller). For Class B, we accommodate diameters over 24mm or lengths exceeding 10d or 150mm. Our products adhere to strict specifications for edge dimensions, diagonal sizes, thickness, and length tolerances, ensuring that you receive only the best from our China factory.

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Surface treatments such as blackened, electrogalvanized, Dacromet, hot-dip galvanized, and galvanized options are available to suit various applications and enhance corrosion resistance. Trust our China suppliers for your bolt needs and experience the quality that distinguishes us in the industry.

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    Product Detail

    Product introduction introduction

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    The general thread diameter specification of DIN 933 bolts is M3-M64, and the common carbon steel performance grades are mainly 8.8 and 10.9. When d ≤ 39mm, stainless steel is usually A2-50/A2-70/A4-70/A4-80, which can refer to ISO 3506-1 or DIN 267-11.

    The bolts of this standard are generally in metric (coarse thread) and fine thread, measured in millimeters (mm). The tolerance for DIN 933 coarse thread is 6g. Common coatings on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non electrolytic zinc powder coating (GEO). The tolerance fit before coating is mainly 6g/6H, and the tolerance band fit after galvanizing can be changed to 6h/6G. However, due to the influence of surface coating thickness after coating, when testing threads with corresponding tolerance gauges, there may be situations where they cannot fit. At this time, nut installation testing with matching specifications can be carried out.

    Application Fields of DIN 933 Bolt

    DIN 933 bolt is a fully threaded hexagonal head bolt with a wide range of applications, commonly found in the following fields:

    1. Mechanical manufacturing: used for the assembly and fixation of mechanical equipment, connecting various mechanical components.
    2. Construction engineering: such as fixing steel structures, installing brackets, connectors, etc.
    3. Automotive industry: can be used for fastening parts such as the engine, chassis, and body of automobiles.
    4. Electronic devices: They play a role in connecting and fixing in the assembly of some electronic devices.
    5. Petrochemical industry: suitable for the connection of chemical equipment, pipelines, etc. Some DIN 933 bolts can meet the anti-corrosion requirements of the chemical environment.
    6. Shipbuilding industry: used for ship construction and equipment installation.
    7. Aerospace: Used in areas with high requirements for strength and reliability.
    8. Energy field: including the installation and fixation of equipment such as wind power generation and solar energy.
    9. Manufacturing of pumps and valves: as connectors for pump shafts and valve stems.
    10. Industrial equipment: Assembly of various general industrial equipment.
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    Frequently Asked Questions (FAQ)
    Q: What is the thread diameter range for DIN 933 bolts?
    The general thread diameter specification of DIN 933 bolts ranges from M3 to M64.
    Q: What are the common material performance grades for DIN 933 bolts?
    For carbon steel, performance grades are mainly 8.8 and 10.9. For stainless steel (when d ≤ 39mm), the common grades are A2-50, A2-70, A4-70, and A4-80.
    Q: What surface coatings are commonly used for DIN 933 bolts?
    Common coatings on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non-electrolytic zinc powder coating (GEO).
    Q: What is the standard thread tolerance for DIN 933 bolts?
    The standard tolerance for DIN 933 coarse thread is 6g. Before coating, the tolerance fit is mainly 6g/6H, which can change to 6h/6G after galvanizing.
    Q: What should be done if the bolts do not fit thread tolerance gauges after coating?
    Due to the thickness of the coating, standard tolerance gauges might not fit. In this situation, you can perform nut installation testing with matching specifications to verify suitability.